*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body{
    display: flex;
    justify-content: center;
    background-color: rgb(19,157,193);
}
.a{
    position: relative;
    top: 100px;
    width: 1000px;
    height: 600px;
    background-image: url(./imgs/02.jpg);
    background-size: cover;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}
.b,.c,.d,.e{
    position: absolute;
    width: 1000px;
    height: 600px;
    filter: drop-shadow(4px 4px 12px rgba(0,0,0));
    background-size: cover;
    opacity: .7;
    transition: 1.5s;
}
.b::after
,.c::after
,.d::after
,.e::after
{
    content: "";
    position: absolute;
    width: 1000px;
    height: 600px;
    background-image: url(./imgs/02.jpg);
}
.b{
    left: -400px;
    transform: rotateZ(100deg);
    overflow: hidden;
}
.b::after{
    transform: rotateZ(-100deg);
}
.c{
    left: -400px;
    transform: rotateZ(-100deg);
    overflow: hidden;
}
.c::after{
    transform: rotateZ(100deg);
}
.d{
    right: -400px;
    transform: rotateZ(100deg);
    overflow: hidden;
}
.d::after{
    transform: rotateZ(-100deg);
}
.e{
    right: -400px;
    transform: rotateZ(-100deg);
    overflow: hidden;
}
.e::after{
    transform: rotateZ(100deg);
}
.f{
    opacity: 0;
    font: 900 50px '';
    /* 设置字体间距 */
    letter-spacing: 10px;
    color: rgb(60,60,70);
    transition: 1.5s; 
}
/* 设置动画过渡 */
.a:hover .b{
    left: -570px;
}
.a:hover .c{
    left: -610px;
}
.a:hover .d{
    right: -570px;
}
.a:hover .e{
    right: -610px;
}
.a:hover .f{
    opacity: 1;
}

